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Petrogenesis of granitic unit of Naqadeh complex, Sanandaj–Sirjan Zone, NW Iran

النشأة الصخرية للوحدة الجرانيتية لمعقدة نقده ، بمنطقة سننداج - سرجان شمال غرب إيران

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Abstract

The granitic unit is a component of the Naqadeh plutonic complex, NW of Sanandaj–Sirjan Zone (NW Iran). This unit is composed of high-K calc-alkaline, slightly peraluminous (ASI = 1.12–1.17) evolved monzogranites. These monzogranites have 41.85 ± 0.81 Ma (zircon U–Pb sensitive, high-resolution ion microprobe (SHRIMP) age) with two inherited zircon ages of 98.5 ± 1.7 and 586.6 ± 13.1 Ma, respectively. The only enclave type consists of quartz-amphibolite enclaves indicating residual parental rocks. Chemical and isotopic (87Sr/86Sr40Ma = 0.708638; εNd40Ma = −4.26) characteristics of monzogranites suggest that they could be derived by partial melting of crustal mafic rocks followed by some assimilation of metasedimentary rocks. With regards to inherited zircon age and quartz-amphibolite composition of Naqadeh granite, the old mafic rocks of this complex (Naqadeh dioritic rocks with ~100 Ma) can be considered as parental rocks, and their partial melting under high water content, and assimilation of produced melt by metasedimentary rocks, would lead to the generation of a Naqadeh granitic unit.

الملخص العربي

تعتبر هذه الوحدة الجرانيتية جزء من معقدة نقده الجوفية بمنطقة سننداج –سيرجان من شمال غرب إيران . وتتكون هذه الوحدة من مونزوجرانيت عالى الكالسى قلوية البوتاسية وقليل الألوماتية. عمر هذه المونزوالجرانيتات حوالى 41.85±0.81 مليون سنة مع عمرين للزيركون 98. 5±1.7 و 586.6±13.1 مليون سنة.يتكون النوع الجيبى الوحيد من جيوب كوارتز- أمفيبوليت مما يدل على بقايا صخور أبوية أصلية. وتدل الخواص الكيميائية والنظائرية للمونزوجرانيت على أن هذه الصخور نتجت من انصهار جزئي لصخور القشرة القاعدية أتبعها بعض امتصاص من صخور رسوبية متحولة. بالنسبة لعمر الزيركون وتركيب كوارتز- أمفيبوليت لجرانيت نقدة، فإن الصخور القاعدية القديمة لهذه المعقدة هى الصخور الأصلية التى أدى الإنصهار الجزئى تحت محتوى مائى عالى وامتصاص الصهير المنتج بواسطة الصخور الرسوبية المتحولة إلى تكوين وحدة نقدة الجرانيتية.

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Acknowledgements

We are grateful to two anonymous referees for helpful revision of the manuscript and the staff of the Department of Mineralogy and Petrology, University of Granada, for their help in the analyses.

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Authors and Affiliations

  1. Department of Geology, Payame Noor University (PNU), Sabzevar, Iran

    Seyed Ali Mazhari

  2. Department of Geology, Tarbiat Moallem University, 49, Mofatteh Avenue, Tehran, 15614, Iran

    Sadraldin Amini

  3. Geological Survey of Iran, P.O. Box 13185-1494, Tehran, Iran

    Jalil Ghalamghash

  4. Department of Mineralogy and Petrology, Fuentenueva Campus, University of Granada, 18002, Granada, Spain

    Fernando Bea

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  1. Seyed Ali Mazhari
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Correspondence to Seyed Ali Mazhari.

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Mazhari, S.A., Amini, S., Ghalamghash, J. et al. Petrogenesis of granitic unit of Naqadeh complex, Sanandaj–Sirjan Zone, NW Iran. Arab J Geosci 4, 59–67 (2011). https://doi.org/10.1007/s12517-009-0077-6

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